This demo is based on STemWIN enclosed in this example.
The STemWIN is a free version for STM32 family derived from SEGGER emWIN.
This demo is for ATOLLIC v.9.3.
When you turn on/off the bulb on the display, also the green led, LD1 is turn on/off.
LD1 is near the RESET BUTTON, on the back of the board.
For more info see here